Create a New Server Certificate and CA Certificate

If you do not have your own custom certificate authority (CA) and server certificate (for example, a trusted certificate that your organization uses), you can use Nessus to create a new server certificate and CA certificate.

This server certificate is signed by the Nessus CA, which means your browser may report that the server certificate is untrusted.

To create a new custom CA and server certificate:

  1. Access the Nessus CLI as an administrator user or a user with equivalent privileges.

  2. Run the nessuscli mkcert command:

    This command places the certificates in their correct directories.

  3. When prompted for the hostname, enter the DNS name or IP address of the Nessus server in the browser such as https://hostname:8834/ or https://ipaddress:8834/. The default certificate uses the hostname.

What to do next:

  • Because Nessus Certification Authority is not a trusted valid certificate authority, the certificate is untrusted, which can result in the following:

    • Your browser may produce a warning regarding an unsafe connection when you access Nessus via HTTPS through port 8834.

    • Plugin 51192 may report a vulnerability when scanning the Nessus scanner host.

    To resolve either of those issues, Trust a Custom CA. For more information about how Nessus uses custom SSL server certificates and CAs, see Custom SSL Server Certificates.